4x^2+11x-19=0

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Solution for 4x^2+11x-19=0 equation:


Simplifying
4x2 + 11x + -19 = 0

Reorder the terms:
-19 + 11x + 4x2 = 0

Solving
-19 + 11x + 4x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
4 the coefficient of the squared term: 

Divide each side by '4'.
-4.75 + 2.75x + x2 = 0

Move the constant term to the right:

Add '4.75' to each side of the equation.
-4.75 + 2.75x + 4.75 + x2 = 0 + 4.75

Reorder the terms:
-4.75 + 4.75 + 2.75x + x2 = 0 + 4.75

Combine like terms: -4.75 + 4.75 = 0.00
0.00 + 2.75x + x2 = 0 + 4.75
2.75x + x2 = 0 + 4.75

Combine like terms: 0 + 4.75 = 4.75
2.75x + x2 = 4.75

The x term is 2.75x.  Take half its coefficient (1.375).
Square it (1.890625) and add it to both sides.

Add '1.890625' to each side of the equation.
2.75x + 1.890625 + x2 = 4.75 + 1.890625

Reorder the terms:
1.890625 + 2.75x + x2 = 4.75 + 1.890625

Combine like terms: 4.75 + 1.890625 = 6.640625
1.890625 + 2.75x + x2 = 6.640625

Factor a perfect square on the left side:
(x + 1.375)(x + 1.375) = 6.640625

Calculate the square root of the right side: 2.576941016

Break this problem into two subproblems by setting 
(x + 1.375) equal to 2.576941016 and -2.576941016.

Subproblem 1

x + 1.375 = 2.576941016 Simplifying x + 1.375 = 2.576941016 Reorder the terms: 1.375 + x = 2.576941016 Solving 1.375 + x = 2.576941016 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.375' to each side of the equation. 1.375 + -1.375 + x = 2.576941016 + -1.375 Combine like terms: 1.375 + -1.375 = 0.000 0.000 + x = 2.576941016 + -1.375 x = 2.576941016 + -1.375 Combine like terms: 2.576941016 + -1.375 = 1.201941016 x = 1.201941016 Simplifying x = 1.201941016

Subproblem 2

x + 1.375 = -2.576941016 Simplifying x + 1.375 = -2.576941016 Reorder the terms: 1.375 + x = -2.576941016 Solving 1.375 + x = -2.576941016 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.375' to each side of the equation. 1.375 + -1.375 + x = -2.576941016 + -1.375 Combine like terms: 1.375 + -1.375 = 0.000 0.000 + x = -2.576941016 + -1.375 x = -2.576941016 + -1.375 Combine like terms: -2.576941016 + -1.375 = -3.951941016 x = -3.951941016 Simplifying x = -3.951941016

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.201941016, -3.951941016}

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